Upgrading ZFS File Systems

If you have ZFS file systems from a previous Solaris release, you
can upgrade your file systems with the zfs upgrade command to take advantage of the
file system features in the current release. In addition, this command notifies you
when your file systems are running older versions.

For example, this file system is at the current version 5.

# zfs upgrade
This system is currently running ZFS filesystem version 5.
All filesystems are formatted with the current version.

Use this command to identify the features that are available with each file
system version.